UPDATE 1 — Orion180 Insurance valued at $1.14 billion as shares fall in debut
(Adds share moves in paragraph 2, background details throughout) Sept 18 (Reuters) — Orion180 Insurance was valued at $1.14 billion after its shares fell in its Nasdaq debut on Friday. Shares opened at $11.50 after the Melbourne, Florida-based company priced its IPO at $12 per share, below its marketed range of $15 to